﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Mvc;
using System.Web.SessionState;
using System.Drawing;
using System.Drawing.Design;

using Think.Lenovo.Com.Models;
using Think.Lenovo.Com.Models.Users;
using Think.Lenovo.Com.DataAccess;
using Think.Lenovo.Com.DataAccess.User;

namespace Think.Lenovo.Com.Controllers
{
    public class LoginController : Controller, IRequiresSessionState
    {
        public ActionResult Index()
        {
            return View("/Views/ViewLogin.cshtml");
        }
        public ActionResult Login(String UserName, String UserPassword)
        {
            User u = new User();
            ViewUserModel model = u.GetUser(UserName, UserPassword);
            if (model.Id > 0)
            {
                #region //step 1.将model保存在session中
                System.Web.HttpContext.Current.Session["User"] = model;
                #endregion

                #region//Step 2. 根据此用户所属角色,得到该角色的所有权限
                RolePowerRelation rpr = new RolePowerRelation();
                LinkedList<RolePowerRelationModel> list = rpr.GetRolePowerRelationModels(model.UserRoleId);
                List<int> powerIds = new List<int>(); //一堆权限id
                foreach (RolePowerRelationModel item in list)
                {
                    powerIds.Add(item.PowerId);
                }
                #endregion

                #region//Step 3. 根据这一堆权限id,得到一堆权限实体
                Power p = new Power();
                LinkedList<PowerModel> powers = p.GetPower(powerIds);
                #endregion

                #region //Step 4. 将这一堆权限实体保存在session中
                System.Web.HttpContext.Current.Session["UserPowers"] = powers;
                #endregion

                return new RedirectResult("/index.aspx");
            }
            else
            {
                return View("/Views/ViewLogin.cshtml");
            }
        }
       
        /// <summary>
        /// 退出
        /// </summary>
        public void Logout()
        {
            System.Web.HttpContext.Current.Session.Remove("User");
            System.Web.HttpContext.Current.Session.Remove("UserPowers");
            StringBuilder js = new StringBuilder(128);
            js.Append("<script type='text/javascript'>")
                .Append("window.top.location='/Login/Index';")
                .Append("</script>");
            Response.Write(js.ToString());
        }

        public void ShowValidateImage()
        {
            String checkCode = GetValidation(5);  // 产生5位随机验证码字符
            Session["Code"] = checkCode; //将字符串保存到Session中，以便需要时进行验证
            System.Drawing.Bitmap image = new System.Drawing.Bitmap(70, 22);
            Graphics g = Graphics.FromImage(image);
            try
            {
                //生成随机生成器

                Random random = new Random();

                //清空图片背景色

                g.Clear(Color.White);

                // 画图片的背景噪音线

                int i;
                for (i = 0; i < 25; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);
                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }

                Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold));
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2F, true);
                g.DrawString(checkCode, font, brush, 2, 2);

                //画图片的前景噪音点

                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                Response.ClearContent();
                Response.ContentType = "image/Gif";
                Response.BinaryWrite(ms.ToArray());
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
        /// <summary>
        /// 随机获取验证码 
        /// </summary>
        /// <param name="num">验证码位数</param>
        /// <returns></returns>
        private string GetValidation(int num)
        {
            string str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; //"或者写汉字也行"
            string validatecode = "";
            Random rd = new Random();
            for (int i = 0; i < num; i++)
            {
                validatecode += str.Substring(rd.Next(0, str.Length), 1);
            }
            return validatecode;
        }
    }
}
